The Billings Polytechnic Institute yearbook was known as The Poly. It was not published in 1911; 1912; 1915; 1918; 1921-1924; 1931; 1936; 1940-1947. Billings Polytechnic Institute became Rocky Mountain College in 1947 and the subsequent yearbooks were titled The Yellowstone.
Title / Table of Contents pages combined.
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